namespace Microsoft.CSharp.RuntimeBinder.Semantics { internal abstract class Expr { public ExpressionKind Kind { get; } public EXPRFLAG Flags { get; set; } public bool IsOptionalArgument { get; set; } public string ErrorString { get; set; } public CType Type { get; set; } public virtual object Object { get; } protected Expr(ExpressionKind kind); } }